Introduction: In the area of the Triglav National Park, where Double Lake is located, despite numerous nature protection measures, anthropogenic impact is noticeable, highlighting mountain tourism. Local sources of pollution are noticeable, such as wastewater from alpine huts, which includes water from toilets and kitchens. Purpose: The aim of the master thesis is to assess the impact of municipal wastewater from the Mountain Hut at the Triglav Lake on the microbiological and chemical status of Double Lake, located next to the hut, and the Močivec Reservoir. Močivec is located in front of the hut and does not come into contact with the wastewater of the hut. Methods: We took thirty samples at three sampling sites between June and October. Before sampling, we performed field measurements of water temperature, electrical conductivity and pH. In chemical analyses of Double Lake and Močivec we determined concentration of the parameters of nitrogen, total phosphorus, nitrate, nitrite, ammonium, chemical oxygen demand (COD) and biological oxygen demand (BOD5). For all these parameters, with the exception of BOD5, we used the spectrophotometric method with cuvette assays. For BOD5, we used manometric method. To analyse the microbiological status, we checked the samples for the presence of faecal coliforms, E. coli and intestinal enterococci, using the membrane filtration method. Results: Microbiological analyses showed the highest load of faecal coliforms and E. Coli in Lake Five. Between July and October, faecal coliform levels ranged from 2 to 20 CFU/100mL, E. coli levels peaked in August with 14 CFU/100 mL. Enterococci were present in samples of Lake Five and Lake Six, with 180 and 120 CFU/100 mL in October. In all samples taken, the chemical parameters were below the detection limit of the device, with the exception of NH4, which in October was 1.64 mg/L in the sample from Lake Five, 2.03 mg/L in the sample from Lake Six and 1.92 mg/L in the sample from Močivec. Discussion and conclusion: Open Mountain Hut at the Triglav Lake for visitors, with municipal wastewater, affects the microbiological condition of Double Lake. The surface water quality of the Močivec is significantly better than the surface water quality of Double Lake.
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